Iron alloy.



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warren RUBEL, or critorrn'nnune, GERMANY.

IRON ALLOY.

1W0 Drawing.

To all whom it may concern "Be it known that I, WALTER Ri'innn, a

citizen of the Empire of Germany, residing at Reichsstrasse 103, Charlottenburg-lVestend, in the Empire of Germany, have invented a new and useful Iron Alloy, of which the following is a specification.

The present invention has for its object a novel dynaino iron and a process for manufacturing same. The novel iron is mainly intended for the production of dynamo plates and it is advantageously difierenalmost entirely eliminated. In order to attain this result, the aluminium must be distributed as uniformly as possible betweenthe iron molecules and thinly coat them. As from'l to 2% of aluminium is sufiicient for this purpose, the electrical conductivity is not so much "reduced as to render it difficult to magnetize the iron by" the current. Consequently, no more ampere windings than with ordinary iron are required. The conditions are difi'erent as regards hysteresis however. As 'is known th1s phenomenon is explained by the assumption that in the penetration of the electric current and the;

reversal of the poles in the iron, the molecules are selected in correspondence with the velocity of the reversal of polarization.-

This gives rise to frictional heat, the amount ofwhich exactly corresponds with the lossof power experienced in the power employed .cordingly,"the greater the ment of the iron molecules, the smaller 1s from the exterior, of course after deducting the small loss due to eddfy currents. -Acreedom of movethe loss 'due to hysteresis. This theory is supported byf'the fact that the loss by" hysteresis is smaller wb 11 upon reversal of the polarizatiomthe iro body is Sub ected to quick external hammering. Tn th1s case,

. the decrease ofthe loss by hysteresis corresponds tothe work expended in hammering the iron. The reversal of the iron molecules is even facilitated by the shocks. Conv Specification of Letters Patent. I

. knowh.

Tron containing 1.5% of aluminium and Patented net. ia oia.

Application filed October 22,1913. Serial N o. 796,671.

sequently, a diminution of the lossby hysteresis could be obtained if the reversal of the iron molecules could be facilitated. This is the case with the iron which forms the object of the present invention owing to the fact that the form of the iron crystals is converted from that of coarse cubes as hitherto into a finely granular form by means of suitable additions which combine with the aluminium and not with the iron.

Now it has been found that this result can only be attained and that the best kinds of iron are only produced when silicon is added in addition to the aluminium. The total quantity of aluminium and silicon should not exceed 3% of the iron and the quantity of aluminium should be located betwee- 1 and 2% and the quantity of silicon be ween 0.8 and 1.2%. This results in an iron alloy which is greatly superior to the known silicon 1I'OI1 plates as regards flexibility mildness and other mechanical properties. Its magnetizability is very good and quite equal to that of the aluminium iron. Y

It is known to reduce the loss ff wattage by making an addition, of silico i to iron. This iron is however, so hard and bristle that it is only with difficulty that it can be rolled out into thin plates so that the cost of manufacturing silicon iron plates is dis-,

proportionately high. The mechanical after treatment of these plates also presents 'difliculties and the wear of the tools employed is very great. The novel iron containing silicon and aluminium in the proportions indicated can readily be rolled and consequently its cost is approximately one half that of the silicon iron plates hitherto 1% of silicon presents a wattage loss which does not exceed 1.7%. Of this loss 0.15% is due to eddy currents and 1.55% to hysteresis. With 25 ampere windings the magnetizability amounts to 14500. The bending coeflicient is however 70 as compared with 6 which is the coeflicient of the known silicon plates containing approximately 2% of silicon. The silicon can be replaced by equalquantities of boronwith the same satisfactory results. In this case also an extremely -:fine division of the iron molecules takes place.

In manufacturing the novel kind of iron an iron presenting the maximum degree of purity is produced in any convenient manner such for. example as by the combination of an acid and a basic process and the added to the iron in the form of metal or 11:. the form of an iron alloy.

I claim: I

An iron alloy suitable for the manufacture of electric-dynamical machines, containing less than 3% aluminum and silicon, and consisting of iron of 99.5% purity, and of a mixture containing 12% aluminum, and 08-12% silicon, substantially as described.

WALTER RUBEL.

Witnesses:

VOLDEMAR HAUPI, HENRY HAsPER. 

